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Automatic sound field sampling mechanisms to disseminate the unit watt in airborne sound
RISE, SP – Sveriges Tekniska Forskningsinstitut.
2016 (English)In: Proceedings of the INTER-NOISE 2016 - 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, 2016, 6757-6761 p.Conference paper, Published paper (Refereed)
Abstract [en]

For the dissemination of the unit watt, the sound pressures emitted by primary and secondary sound power standards are to be measured. Disseminating the unit in reverberant fields requires the measurement of a volume average whereas in hemi-anechoic fields, measurements on an enveloping surface are appropriate. For the latter situation, automatic sound field scanning mechanisms were developed by LNE, SP and PTB. At PTP, an arc with 24 microphones is used which can be tilted to cover a hemispherical measurement surface. Different radii can be realised by manual adjustment of the microphones. At SP, a single microphone is moved on a semi-circular arc. Different latitudes can be realised by manual arrangements. LNE developed a scanning mechanism consisting of a hemi-circular arc. A microphone can be positioned on arbitrary altitude positions on the arc and the arc can move on a circular path. This way, arbitrary positions on a hemispherical measurement surface can be realised. The contribution introduces the different mechanisms and lists advantages and disadvantages of the different technical solutions. © 2016, German Acoustical Society (DEGA). All rights reserved.

Place, publisher, year, edition, pages
2016. 6757-6761 p.
Keyword [en]
Calibration, Free-field over a reflecting plane (hemi-anechoic rooms), Sound power, traceability, Acoustic field measurement, Acoustic fields, Acoustic variables control, Acoustics, Microphones, Anechoic rooms, Arbitrary positions, Different mechanisms, Enveloping surface, Scanning mechanisms, Sound power, Sound pressures, Technical solutions, Acoustic noise
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27618Scopus ID: 2-s2.0-84994613411OAI: oai:DiVA.org:ri-27618DiVA: diva2:1059669
Conference
45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future, INTER-NOISE 2016, 21 August 2016 through 24 August 2016
Note

References: Determination of Sound Power Levels and Sound Energy Levels of Noise Sources Using Sound Pressure - Precision Methods for Anechoic Rooms and Hemi-anechoic Rooms, , ISO 3745:2012

Available from: 2016-12-22 Created: 2016-12-21 Last updated: 2016-12-22Bibliographically approved

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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
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  • text
  • asciidoc
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